Netherstorm is in my opinion the best place to pick up a cat of any quality. I can confirm that they spawn with Nether Roach as well as Nether Fledgling. Within about 15 min I found a rare tied to a Nether Roach. Mouse is also a common side spawn with Nether Roach, so I also picked up a lvl 19 Rare to replace my lvl 3 same trip. Good Luck.
Netherstorm is in my opinion the best place to pick up a cat of any quality. I can confirm that they spawn with Nether Roach as well as Nether Fledgling. Within about 15 min I found a rare tied to a Nether Roach. Mouse is also a common side spawn with Nether Roach, so I also picked up a lvl 19 Rare to replace my lvl 3 same trip. Good Luck.